package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetMealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list =  shoppingCartMapper.list(shoppingCart);
        //如果已经存在，则直接更新数量
        if(list != null && !list.isEmpty()){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() +1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在，则插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(java.time.LocalDateTime.now());
            }else {
                //套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(java.time.LocalDateTime.now());
            }
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    /**
     * 展示购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(currentId).build();
        List<ShoppingCart>  list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     *
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}
